Abstract: An apparatus and method for enhanced calibration of radar at the module level supports dual polarization and array calibration and alignment without the use of external test equipment. Utilizing a delay line, loop back capability at the module level allows existing receiver exciter subsystem to be used for calibration. This approach eliminates the need for manual array calibration using external RF monitor subsystem or external test antennas.

Abstract: An apparatus and method for enhanced calibration of radar at the module level supports dual polarization and array calibration and alignment without the use of external test equipment. Utilizing a delay line, loop back capability at the module level allows existing receiver exciter subsystem to be used for calibration. This approach eliminates the need for manual array calibration using external RF monitor subsystem or external test antennas.

Abstract: An apparatus and method for enhanced calibration of radar at the module level supports dual polarization and array calibration and alignment without the use of external test equipment. Utilizing a delay line, loop back capability at the module level allows existing receiver exciter subsystem to be used for calibration. This approach eliminates the need for manual array calibration using external RF monitor subsystem or external test antennas.

Abstract: A radar system uses multiple-beam maximum likelihood estimation (MLE) during both search and tracking operations. During search, a four beam sequential beam cluster may be used to search for targets in a region-of-interest. During tracking, a three beam triad may be used to track one or more detected targets. In some embodiments, a beam selector switch may be used to allow two offset receive beams to time share a beamformer output port to generate the four beam sequential cluster.

Abstract: An apparatus and method for enhanced calibration of radar at the module level supports dual polarization and array calibration and alignment without the use of external test equipment. Utilizing a delay line, loop back capability at the module level allows existing receiver exciter subsystem to be used for calibration. This approach eliminates the need for manual array calibration using external RF monitor subsystem or external test antennas.

Abstract: A radar system uses multiple-beam maximum likelihood estimation (MLE) during both search and tracking operations. During search, a four beam sequential beam, cluster may be used to search for targets in a region-of-interest. During tracking, a three beam triad may be used to track one or more detected targets. In some embodiments, a beam selector switch may be used to allow two offset receive beams to time share a beamformer output port to generate the four beam sequential cluster.

Abstract: Methods and apparatus for providing a radar system that rejects intermodulation products than can generate false targets. In one embodiment, a method includes transmitting a first signal at a first time at a first frequency to detect a target within a first altitude range, determining a range from a first receive time to a second receive time for possible signal return from the target within the first altitude range, receiving the possible signal return from the target in a frequency band of interest based upon the first frequency while transmitting a second signal at a second frequency spaced a selected frequency distance from the first frequency to place transmit feedthrough outside of the receive frequency band of interest and false target return outside the frequency band of interest for rejecting intermodulation products.

Abstract: A dielectric resonator filter suitable for use at L-band includes a puck-shaped dielectric resonator attached directly to a dielectric substrate which is bonded to the cavity base in order to decrease vibration sensitivity while retaining a relatively high loaded Q of the dielectric resonator filter. The high value of Q is attained by the use of a low loss dielectric substrate with a dielectric constant sufficiently high that the electrical dimensions of the cavity approximate the free space or optimum model wherein the resonator is positioned at the center of the cavity. The disclosure describes a dielectric resonator filter having a loaded Q in excess of 6500 at 1.538 GHz with an insertion loss of 6 db, while maintaining a vibration sensitivity of 2.2.times.10.sup.-8 G.sup.-1. An arcuate segmented line comprising a plurality of tracks used as a coupling structure permits individual selection for each filter of the coupling, while not degrading the loaded Q value or the vibration performance.